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"Indirector" Attack Disclosed For Intel Alder Lake & Raptor Lake CPUs
UC San Diego researchers have gone public with Indirector, high-precision branch target injection attacks on the indirect branch predictor
It presents, for the first time, a comprehensive picture of the IBP and the BTB within the most recent Intel processors, revealing their size, structure, and the precise functions governing index and tag hashing. Additionally, this study reveals new details into the inner workings of Intel's hardware defenses, such as IBPB, IBRS, and STIBP, including previously unknown holes in their coverage. The UCSD researchers suggest mitigating Indirector by using IBPB (Indirect Branch Predictor Barrier) more aggressively and better securing the BPU design.
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